Explosive.



. tetranitroglycerin absorbed in Wood pulp or UNITED STATES PATENT orrion 'FIN-SPARRE, ,oF WILMINGTON, DELAWARE, ASsI NQR-To THE DUPONT DE NEMOURS POWDER COMPANY, oF ILMI T N, DELAWARE, A COR- .PORATIGN OF NEW JERSEY? EXPLOSIVE.

Specification of Letters Patent.

Patented, April 3o, 1 907.

Application filed September 11,1906. SeriaLNo. 384,082.

T all, whiu'rfiit may concern:

Be it known that I, FIN SPARRE, a subject of the King'ofNorway,

'also stable and comparatively insensitive. I

have also discovered that when mixed with trinitroglycerin (ordinary nitroglycerin) it imparts to it a non-freezing quality and lessens its dangerous sens'itiveness. The invention consists ina practical application of my discoveryof the valuable qualities of .tetranitrodiglyc'erin as an explosive, and to this end the invention consists in other porous substance preferably associated both with trinitroglyce'rin and nitrate of soda by. the excellent and nitroglycerin are uti 'zed While its objectionable features are avoided. The 111-- or other inorganic-oxidizing agent. The trinitroglycerin and the tetranitrodiglycerin, and mostly 'so the trinitroglycerin, eachperform the function of a blasting oil, while the tetranitrodiglycerin also performs the functions of .lowering'the freezing point of the mixture and rendering it less sensitive, whereprincipal trate of soda acts both as a dope and as a supplier of oxygen to more readilyeifect the combustion of the wood pulp. r The tetranitrodiglycerin is. formed by the nitration of diglycerin, the process being substantially the same as the nitration of glycerin to form the ordinary trinitroglycerin.

The following are examples of explosives containing te tranitro diglycerin:

I. 25%- ordinary nitroglycerin, 15% tetranitrodigl cerin, nitrate of soda, ]0%

Wood p p.

eculiar qualities of'trithis 7th day of Sept, 1906.

II 115% ordinary nitroglycerin l57j tetranitrodiglycerin, 3% sulfur, 2% rosin," nitrate of soda, 5%-wood pulp, 5%-sawdust.- III. 20% ordinary nitroglycerin, 10% tetra--- nitrodiglycerin, 3% collodian1cotton, 27.% ammonium nitrate, 30% nitrate-'-i offf soda,-

10% wood pulp.

v The ingredients are si in the ordinary way ern loyed the manufacture of dynamite, ya though,prefera bly, the tetranitrodiglycerin is first. Iifixe'dj with iy'jmixedtqge i the ordinary Intro-glycerin beforethe other ingredients are added. Having now fully described myinventlon,

what I claim and desire'to protect-byLetters Patent is:

. 1. An explosive containing .tetranitr di glycerin", an inorganic oxidizing 'agent anda porous substancesubstantially as described. i

2. An explosive containing tetranitrddiglycerin, trinitroglycerinand a porous substance in which the same are absorbed sub stantially as described.

3 An explosive containing ttranitrodiglycerin, trinitroglycerin, an inorganic oxi-' diz'ing agent and a porous carbonaceous substance substantially as described.

4. An explosive containingtrinitroglyce erin, tetranitrodiglycerin, nitrate of soda and-- wood pulp substantially as described.

5. An explosive substance containing .of

tetranitrodiglycerin 5 to 30 per cent, of tri-'- nitroglycerin-l0 to '45 per cent, of an inor ganic oxidizing agent 15 to 75 per cent. and of a porous carbonaceous substance 5'to 25 per cent.,, substantially as described.

In testimony of which invention,I -have hereunto set "my hand, at Wilmington, on

" FIN SPARRE.

Witnesses:

FRA K H. MAsoN, .S. M. MUN-DA. 

